220 mW Amplifier (CB20054E)

The output transistors can be BC548 and BC558. The circuit is from a 1975 documentation showing a frequency response from 90 Hz to 12.5 kHz.

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Modulated infrared transmitter (CB7028E)
We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power...
Simple Diodes Test (CB14700E)
This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current...
RF Monitor (CB21686E)
This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The...